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What do sea trout feed upon at sea?

They are opportunistic feeders and consume a wide range of marine organisms, from small crustaceans taken from the seabed and midwater to fish such as sandeels, sprats and juvenile herring.  Early post-smolts can even be seen feeding at the surface of Scottish sea lochs on wind-blown terrestrial flies. Rapid growth seems to be associated with a quick transition to feeding upon fish.  Seasonal prey abundance and quality may be key components affecting marine growth and survival of sea trout.